Brad Pitt popped into four sneak preview screenings of his upcoming movie, World War Z, on Thursday.

Four!

To hype the thriller, the actor started in Atlanta. Then he jetted to Philadelphia, where he said, "I just crushed a cheesesteak next door. It really is the perfect sandwich."

Next up: Chicago, where he literally ran in to greet fans. He actually had to bend over to breathe and catch his breath. "Hope everyone has done their business, got their snacks," he said in introducing the film, "'cuz once this thing starts, it does not let up."

"I love you, Brad!" a fan shouted.

He smile and promised, "It's the most intense thing you're gonna see all summer."

He finished his whirlwind tour in Austin with Aint It Cool News' Harry Knowles, who asked what Pitt's plan would be to keep Angelina Jolie and the kids safe were during a zombie apocalypse (the storyline of the movie).

Pitt's answer: "Get the fastest car you can find. Cuz those are quick!" He then said, "Mr. Knowles, with your permission, let's kick some zombie (butt)."